Student loan debt burdens 44 million people in the United States. However for CEOs of student loan companies, or investors on Wall Street, student debt is a lucrative commodity to be bought and sold for profit.

Corporations such as Navient, Nelnet, and PHEAA service outstanding student debt on behalf of the Department of Education. These companies also issue Student Loan Asset-Backed Securities (SLABS) in collaboration with major financial institutions like Wells Fargo, JP Morgan, and Goldman Sachs. For these firms and their creditors, debt isn’t just an asset, it’s their bottom line.

Yet the financialization of student debt is almost never reported on in the media. There is little public awareness that when student borrowers sign their Master Promissory Notes (affirming that they will repay their loans and “reasonable collection costs”), their debts may be securitized and sold to investors.

There are two main types of SLABS: those backed by loans made by private lenders, and those backed by loans made through the Federal Family Education Loan program (FFEL). The majority of all student debt today is the $1.1 trillion loaned by the federal government through the Direct Lending program. While these loans cannot be securitized directly, they can be if borrowers consolidate or refinance their loans through a private lender.

Private student loan debt accounts for roughly $120 billion of the $1.6 trillion total outstanding debt. Companies such as SoFi refinance student loans, and have issued $18 billion in SLABS since their founding in 2011. These loans are highly favorable to lenders – as borrowers who default on private loans face greater consequences than those who default on federal loans.

FFEL loans are made by private lenders that are guaranteed by the federal government if borrowers default, which incentivizes riskier lending. Although Congress ended the program in 2010, there are still roughly $280 billion of FFEL loans outstanding, and the largest firms such as Navient and Nelnet retain FFEL loans in their portfolios and have continued to issue FFEL-backed SLABS.

First and foremost, student loans cannot be collateralized. With MBS, the loans were collateralized by the house or property being purchased, but the “equity” in student loans is the borrower’s future expected earnings, which are difficult to quantify. Secondly, the overall market for SLABS is a fraction the size of the MBS market before the financial crisis. Finally, because of federal guarantees for FFEL loans and the 2005 bankruptcy laws, it is uncommon that the student loan companies will lose the value of their underlying investment, even when trends are showing that students are increasingly unable to pay their loans.

While SLABS may not pose the same level of systemic threat to the global financial system that MBS posed, there are legitimate concerns that this market poses serious systemic risks.

Navient is the largest student loan servicing company and the largest issuer of SLABS. In filings with the SEC, Navient acknowledges the following risk factors: “An economic downturn may cause the market for auction rate notes to cease to exist… Holders of auction rate securities may be unable to sell their securities and may experience a potentially significant loss of market value.”

Due to the “securitization food chain”, if Navient or other SLABS issuers and holders experience a significant loss of revenue, they could default on their obligations – triggering negative consequences for Wall Street firms that market these securities to investors and supply credit to the greater public.

There are a few different ways this could happen. SLABS are created in a way that minimizes risk by spreading it around, but if significant numbers of student debtors default on their loans, the securities could lose their value if rating agencies downgrade them. Another possibility is that federal bankruptcy reform could favor student borrowers – which would certainly affect the market for SLABS.

Some Democratic presidential candidates have proposed significant policies to cancel student debt – Bernie Sanders’ plan would cancel all $1.6 trillion of outstanding student debt, while Elizabeth Warren’s plan would cancel up to $50,000 of student debt for 42 million Americans. These policies would make it less likely that the SLABS that have been issued would ever fully pay out, especially given that many of them will not reach their final maturity for decades.

Rather than endure the Sisyphean burden of unpayable debt, young people could exploit the vulnerabilities of the SLABS market via debt strikes or boycotts, as advocated during the Occupy Wall Street movement in 2011. Fear about the consequences of default may keep American student debtors from organizing such a strike, but greater public awareness about SLABS and the acceleration of present crises may incite more radical action.

“For thousands of years, the struggle between rich and poor has largely taken the form of conflicts between creditors and debtors”, writes David Graeber in his comprehensive 2011 book Debt: The First 5000 Years. “By the same token, for the last five thousand years, with remarkable regularity, popular insurrections have begun the same way: with the ritual destruction of the debt records-tablets.”

Activists concerned about student debt should ask themselves: what would such a symbolic protest look like in the United States today, and could it become popular enough to pose a significant threat to the status quo?